Multiple Choice
Which of the following reactions is exothermic?
8. Thermochemistry
Endothermic & Exothermic Reactions
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Which of the following reactions would be endergonic, indicating a positive change in Gibbs Free Energy (ΔG > 0)?
A
Photosynthesis in plants
B
Combustion of glucose
C
ATP hydrolysis
D
Respiration in cells
Verified step by step guidance1
Understand the concept of Gibbs Free Energy (ΔG): It is a thermodynamic quantity that indicates the spontaneity of a reaction. A negative ΔG means the reaction is spontaneous (exergonic), while a positive ΔG means the reaction is non-spontaneous (endergonic).
Identify the nature of each reaction: Photosynthesis, combustion of glucose, ATP hydrolysis, and respiration in cells.
Analyze photosynthesis: This process involves converting carbon dioxide and water into glucose and oxygen using sunlight. It requires energy input, making it an endergonic reaction (ΔG > 0).
Consider combustion of glucose: This is an exergonic reaction where glucose is oxidized to produce carbon dioxide, water, and energy (ΔG < 0).
Evaluate ATP hydrolysis and respiration: Both are exergonic processes. ATP hydrolysis releases energy for cellular activities, and respiration breaks down glucose to release energy (ΔG < 0).
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